If you throw thr bubble down a lot as defender and you have a decent shotty you csn literally hold an objective/map choke point on your own--for some inexplicable reason everyone on this game has an iq of ten and they run into said bubble thinking they have a chance. But yea either up your armor or agility all the way, screw recovery it's not for your class, and try to find an auto with extra stability or thr one that slows down fire rate when zoomed in (my personal choice for titan class).